Med school and residency will take a lot of your time. However, unlike the previous post, I have yet to meet a single physician (family practice, pediatrician, general surgeon, radiologist, or EM) who works more than 80 hr/wk in private practice. On the other hand, those in academics (which most med students are used to seeing and are biased toward) tend to work slightlly less than residents/wk or slightly more depending on the field that they are in...and they make less $, in general, compared to those in private practice...this is because many spend less time operating or seeing private patients due to academic requirements. As an attending (after residency), you have a lot of options on how your practice is set up (purely private, partly private-academic, full academic). You can pretty much make your own hours, especially if you work in a decent sized group, as most do...although working only 40-50 hours for any physician would be on the low side, while those working > 80-90/wk are on the extreme, even if they are surgeons. Make sure you get a broad perspective, as med students are biased to the academic physicians.